The last offer of 17 million euros was rejected by the Hoops.
“It’s been easy with Matt because he’s a wonderful professional,” Rodgers told Sky Sports.
“I think the challenge for the groups that come to a team like Celtic is to be able to put a price on the league and not on the player. I’ve already told the club.
“We all perceive the style here: the players will come and develop. It is not a club that deserves to stay, however there is wealth in other leagues much richer than ours that allows players to maintain their living conditions.
“We all understand it, but in reality it is vital that if a player leaves here, they pay us the players’ price, and that is something that cannot happen.
“Sometimes a much lower price arrives. I’ve worked in the Premier League, I perceive the careers there and the price of the players. No player will leave unless it is for an assessment. At the moment, no team has come close.